純金属の高温変形における内部応力

抄録

In order to identify the mechanism of high-temperature deformation of pure metals, internal stresses are measured by the stress transient dip test on fcc copper, bcc iron and vanadium, and hcp titanium.
The extrapolation method proposed in the previous paper is applied in determining the critical stress for deformation stagnation in order to minimize the error produced by the recovery during measurements, and it is found in the fcc and bcc metals that the contribution of internal stress to applied stress is nearly 100%. This shows that the deformation mechanism in these metals is recovery-controlled. In hcp titanium, however, the contribution of frictional stress is found to be appreciable in a higher stress range (i.e. higher strain rate range).
Further, the cause underlying the discrepancies between the data reported hitherto concerning the internal stress during creep is discussed and concluded to be due to the recovery effect during measurements.